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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Williamstown Threshold Days by Year (USC00309480)

5 fixed thresholds counted per year at Williamstown (USC00309480): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Williamstown Thresholds

  • Williamstown: days with 10 mm (0.39 in) or more of precipitation in 10 years, most in 1937 with 53.
  • Williamstown: days with 25 mm (0.98 in) or more of precipitation in 10 years, most in 1942 with 16.
  • Williamstown: days with 50 mm (1.97 in) or more of precipitation in 7 years, most in 1940 with 4.
  • Williamstown: days with 10 cm (3.9 in) or more of snowfall in 1 years, most in 2003 with 9.
  • 5 fixed thresholds have at least one qualifying day at Williamstown.
10 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Williamstown Days per year at Williamstown with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 53 in 1937. 02040601932: 511934: 361935: 401936: 451937: 531938: 461940: 461941: 421942: 471943: 471932193419351936193719381940194119421943
Days per year at Williamstown with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 53 in 1937.
Days with 10 mm (0.39 in) or more of precipitation per year at Williamstown
YearDaysDecade average
19325145.2
19343645.2
19354045.2
19364545.2
19375345.2
19384645.2
19404645.5
19414245.5
19424745.5
19434745.5
First to last qualifying date each year at Williamstown For each year, a bar from the first to the last day at Williamstown meeting 10 mm (0.39 in). 1932: 1 January 1932 to 31 December 19321934: 1 January 1934 to 29 December 19341935: 1 January 1935 to 20 December 19351936: 3 January 1936 to 31 December 19361937: 8 January 1937 to 28 December 19371938: 1 January 1938 to 31 December 19381940: 16 January 1940 to 30 December 19401941: 3 January 1941 to 28 December 19411942: 2 January 1942 to 31 December 19421943: 4 January 1943 to 23 December 194319321935193719401942JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Williamstown meeting 10 mm (0.39 in).
First to last qualifying date each year at Williamstown
YearFirst dateLast date
19321932-01-011932-12-31
19341934-01-011934-12-29
19351935-01-011935-12-20
19361936-01-031936-12-31
19371937-01-081937-12-28
19381938-01-011938-12-31
19401940-01-161940-12-30
19411941-01-031941-12-28
19421942-01-021942-12-31
19431943-01-041943-12-23

Every Fixed Threshold

Fixed thresholds at Williamstown
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain1053193747
25 mm (0.98 in): Days with 25 mm or more rain1016194216
50 mm (1.97 in): Days with 50 mm or more rain7419403
10 cm (3.9 in): Days with 10 cm or more snowfall1920039
25 cm (9.8 in): Days with 25 cm or more snowfall1320033

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1932.

Download the Data

  • Data for Williamstown threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).